Fuji Photo Film Company, Limited

Takashi Ohgiyama

Seiichi Watanabe

Naoyoshi Chino

Keiji Shigesada

Masuhiko Hirose

Masahiro Enomoto

Mototada Yasui

Morio Fujiwara

A photo film cassette includes a spool core, on which the photo film is wound in a form of roll. A cassette shell contains the spool core in rotatable fashion. First and second flanges are respectively secured to ends of the spool core, for regulating positions of sides of the photo film roll. A first ring-like lip is formed integrally with a periphery of the first flange, is projected toward the roll, is contacted on one edge of an outermost turn of the roll, and prevent the roll from being loosened. The first and second flanges are formed from resin in accordance with injection molding. The resin has temperature of thermal deformation being 80&deg; C. or higher under 18.6 kg/cm,, modulus in elasticity in flexure being 13,000-30,000 kg/cm,, surface hardness being 80 or more in Rockwell R-scale, and high fluidity in molds for the injection molding. The first and second flanges have an outer diameter of 15 mm or more, thickness of 0.3 mm or less, and a maximum projected area of 100 mm,or more as measured with a contour thereof kept substantially circular.

Method for producing flanges of a photo film cassette

A photo film cassette includes a spool core, on which the photo film is wound in a form of roll. A cassette shell contains the spool core in rotatable fashion. First and second flanges are respectively secured to ends of the spool core, for regulating positions of sides of the photo film roll. A first ring-like lip is formed integrally with a periphery of the first flange, is projected toward the roll, is contacted on one edge of an outermost turn of the roll, and prevent the roll from being loosened. The first and second flanges are formed from resin in accordance with injection molding. The resin has temperature of thermal deformation being 80.degree. C. or higher under 18.6 kg/cm.sup.2, modulus in elasticity in flexure being 13,000-30,000 kg/cm.sup.2, surface hardness being 80 or more in Rockwell R-scale, and high fluidity in molds for the injection molding. The first and second flanges have an outer diameter of 15 mm or more, thickness of 0.3 mm or less, and a maximum projected area of 100 mm.sup.2 or more as measured with a contour thereof kept substantially circular.

Photo film cassette including an improved flange design for retaining

A method and an apparatus for forming a plurality of types of cases which differ in the position of the identification holes, or the like, is provided. The invention can curb equipment costs and help reduce production costs as a result of minimizing the types of molds to be prepared by making shared used of the molds, and can greatly reduce the work required to change the type of case to be molded. The insertion/removal, fixing, or positioning adjustment of the bush pin which forms the identification hole by projecting into the interior of the cavity of the mold forming the case is conducted by a fixing member which passes through the bush pin and screws into the mold, and which can be manipulated from the parting face side of the mold when the cavity is opened.

Method of molding cases used in information detection hole system and

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Kanagawa, Japan

Takashi Ohgiyama